#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;

const int N = 1010;

int n, m;
int f[N][N];
int v[N], w[N];

int main()
{
	cin >> n >> m;

	for (int i = 1; i <= n; i++) cin >> v[i] >> w[i];

	for(int i =1 ;i <= n;i ++)
		for (int j = 0; j <= m; j++)
		{
			f[i][j] = f[i - 1][j];
			if (j >= v[i]) f[i][j] = max(f[i][j], f[i - 1][j - v[i]] + w[i]);
		}
	cout << f[n][m] << endl;
	return 0;
}